GM speed sensors & ECM suggestions

[John Hess]

> ----------
> From: 	TMatthe at aol.com[SMTP:TMatthe at aol.com]
> Sent: 	Sunday, October 05, 1997 8:25 PM
> To: 	diy_efi at coulomb.eng.ohio-state.edu
> Subject: 	Re: GM speed sensors & ECM suggestions
> 
> In a message dated 97-10-05 16:59:34 EDT, you write:
> 
> >  The 1st things that scares me are the vehicle speed sensor and the
> engine
> >  speed sensor & position sensor. I would appreciate any
> input/insight into
> >  these obstacles like whether they use a magnetic missing tooth or
> hall 
> > effect
> >  set-up, etc.
> Do you have a GM Turbo 350/400 tranny? Howell Engine dev. has a VSS
> that
> screws onto the tranny at the speedo cable, but you don't need VSS if
> you
> ground the P/N wire in the ECM harness. Engine speed can be read if
> you adapt
> a GM 7 pin module to a magnetic AMC dist.
> >  
> >   Does anyone have a suggestion for a particular GM ECM that would
> work in 
> > this
> >  application? Or any references available that might help me choose
> the
> right
> >  one? Below is a list of requirements for this injection system.
> The GM 1227730, used in 90-92 TPI cars, and many 4 and 6 cyl GM's
> also...
> >  
> >   -8 injector drivers for sequential injection
> Nope, only 2- So you'd have to batch it... GM GN Turbo ECM only has 6
> drivers
> if I remember correctly...
> >   -Speed-density system (saves me the hassle of fabricating a tight
> intake
> &
> >  MAF upstream of the air door.
> Works here with no problem...
> >   -Ability to interface with a GM transmission control module (I'll
> be
> using 
> Nope , you could get a GM diesel truck transmission controller...
> > a
> >  4L60E behind the engine)
> Doesn't have a speedo output in most apps- I would recommend the
> noncomputer
> 4L60 (aka 700R4)...
There are several sources for the geared tailshaft.  This is not a real
obstacle.  I would recommend the 4L60E because you can more easily
program it for your shift points and it remains dead accurate under a
wide range of conditions.
> >   -Can't be an EEPROM type GM ECM since the CarPROM software can't
> handle 
> > those
> >  boxes
	Go ahead and use the TPS computer (either 86-89, MAF- or 90-92,
MAT). There are several reputable tuners who can program the Memcal
according to your engine statistics.

> The EEPROM GM ECM is really what you want, but no one to my knowledge
> has a
> software pkg. to reprogram these for sale yet to my knowledge...
> 93 LT1's are SD, but I believe that they are batch fire, and harder to
> find,
> and I do not think that they have the intergrated transmission
> controller.
> >   -Knock sensor inputs (I think GM calls it ESC) since this engine
> will be
> 10
> >  to 1 CR
> No problem here.
> >   - And all the other stuff that should be a gimme on a GM box like
> Idle
> air
> >  control, EGR control, canister purge control & cruise control servo
> control.
> Cruise control in pre OBD II GM's is handled by a seperate controller
> I
> believe, rest is no problem...
> Tom M.
>